Furnace



(No Model.)

P. KIEFER, Jr.

FURNACE.

No. 474,173. Patented May 3, 1892.

FIG-.2.

FIG'ni-.

fans co., worm-um UNITED STATES PATENT OFFICE.

PETER KIEFER, JR, or CINCINNATI, OHIO.

FURNACE.

SPECIFIGATION forming part of Letters .Patent No. 474,173, dated May 3, 1892.

Application filed February 16, 1892. Serial No. 421,687. (No model.)

To aZZ whom it may concern:

Be it known that I, PETER KIEFER, Jr., a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the followingto be a full, clear, and exact description of the invention, reference being had to the annexed drawings, which form part of this specification.

The objectof my invention is to construct a steam-boilerfurnace in such a manner as to prevent any excessive generation of smoke after the walls become thoroughly heated, which result is accomplished by a peculiar combination of air-fines, bridge-wall,. baffleplate,smoke-passages, and a pair of openings in the sides of the furnace and above the grate-bars of the same, the details of these features being hereinafter more fully described, and then pointed out in the claims.

In the annexed drawings, Figure 1 is a longitudinal section of a steam-boiler furnace embodying my invention, the boiler being shown in elevation. Fig. 2 is a horizontal section through the walls of the furnace, the baffle-plate and boiler being omitted and the position of thelatterindicated by dotted lines. Fig. 3 is a transverse section of the furnace, taken at the line Z Z of Fig. 1. Fig. 4 is an enlarged vertical section of a portion of one of the side walls of the furnace.

The steam-boiler A, which may be of any approved form, is set within a front B, side walls 0 C, and back D, the front being provided with fire-doors b b and an ash-pit door Z). Located a suitable distance behind this front wall is a bridge-wall E, connecting the sides 0 O and provided with an air-heating chamber F, having one or more doors f, with suitable registers to regulate the draft through said chamber. The front and top of this bridge-Wallis protected by a heavy casting G, having a series of narrow ventages g to permit the escape of hot air from chamber F.

H are grate-bars extending from the furnace-front B to the bridge-wall E, at which point the casting G slopes upwardly and rearwardly, as seen in Fig. 1. Situated above this bridge-wall and at a suitable distance in front of it is the baffle-plate or deflector I, which mayextend horizontally across the furnace,

or it may be arched, as seen in Fig.3; but whichever construction is adopted said deflector must be so arranged as to afford a throat J between it and said bridge. This baffle-plate or deflector is carried up close to the boiler, as seen in said illustration, and has a rearward extension 1', provided with an air-' heating chamber K, having one or more ventages 76, although a series of these openings is preferred.

The space thus inclosed by the side walls 0 C, bridge E, grate H, and deflector I constitute' the fire-chamber or furnace proper, which furnace has on one sidea pair of openings L M, the opening L beingnear the front B and just above said grate, while the other opening M is close to the deflector I and so elevated as to be near the boiler. Furthermore, this front opening L may pass directly through the side wall 0, but preferably it communicates with a diving-passage n at the front end of a horizontal flue N, running longitudinally of said wall and above the other opening M.

n is another diving-passage leading from this fine N to chamber K, and n is a register applied to the inlet end of said flue.

O is an inclined smoke-passage leading from the rear upperopening M down to the bottom of diving-passage n, so as to afford communication with the front lower opening L. This arrangement of openings is duplicated on the opposite side'of the furnace, as indicated .at L and M in Fig. 2, P in this illustration be ing an air-flue in the wall 0, and p p the diving-passages of said fiue.- p is a register at the inlet end of this flue.

R are nozzles capable of being inserted either in the opening L L or in the smokepassage 0 for the purpose of injecting steam, so as to increase the draft of the furnace.

The operation of my smokepreven ting furnace is as follows: After the fire has been burninga sufficient length of time the bridgewall E, casting G, and baffle-plate I, together with its extension 6, become red-hot, and as a natural result the products of combustion passing through the contracted throat J are instantly consumed by contact with these hightly heated surfaces. As the gases, &c., traverse this throat they are brought into intimate union with the numerous jets of hot air escaping from the ventages g k of chambers G K, which heated air assists materially in burning the smoke. In recharging the furnace the fuel should be pitched back so far as to leave an incandescent mass at the front of thegrate-bars, and as all the dense smoke emitted from the fresh coal cannot escape through the throat J the remainder of the gases, 850., must find their exit at the upper openingsMM. Thesurplussmokeandgases readily enter these openings because the baffle-plate prevents a direct exit and also because a powerful draft is constantly drawing the smoke into said openings, which current is induced by the heated air traversing the flues N P and then descending the divingpassages n1). From these passages the heated air escapes directly through the openings L L into the furnace. Consequently the smoke entering the rear openings M M descends the inclined passages 'O, and escaping at these openings 'L L is caused to pass over the bed of incandescent fuel at the front of the furnace,. by which simple and automatic expedient the smoke is immediately consumed. home the peculiar location of the boiler should prevent a free draft either or both of the blowers R R may be started as soon as steam generates within the boiler. Finally, if the boiler-should be unusually long, the bridge-wall and baffie-plate may be (In plicated at any suitable place in rear of the first bridge-wall E, and another change may be effected by running a branch fine 0 from the opening M to passage 01, thereby dispensing with the inclined passage 0. I claim as my invention- 1. In combination with a steam-boiler furnace having a baffle-plate I near the rear end thereof, an opening M in the side wallO and near said baffle-plate, another opening L in said wall near the front of the furnace and above its grate-bars, and a smoke-passage O, that permits the gases to be drawn in at said opening M and dischargedat said opening L, for the purpose described.

2. In combination with a steam-boiler furnace having a baffle-plate 1 near the rear end thereof, an openingM in the side wall Oand near said baffle-plate, another opening L in said wall near the front of the furnace and above its grate-bars, which opening L communicates with a diving-passage n of a horizontal flue N, traversing said wall, and a smoke-passage 0, connecting these openings L M, for the purpose described.

3. The combination, in a steam-boiler furnace, of the side walls 0 C, traversed by airflues N P, having diving branches 717?, and p p, the baffle-plate I, having an air-heating chamber K, provided with a ventage 7c, the

openings L L and M M, located in said side.

walls 0 O in the manner described, the inclined smoke-passage 0, connecting these openings, and the bridge-wall E, having an air-heating chamber F, with an inlet f and a series of ventages' g, all as herein explained, and for the purpose stated In testimony whereof I affix mysignature in presence of two witnesses.

PETER KIEFER, J n. Witnesses:

JAMES H. LAYMAN, ALFRED M. DAVIES. 

